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鄂尔多斯盆地苏里格气田是典型的低效致密砂岩气田,研究区苏48区主力储集层盒8和山1具有低孔、低渗、低丰度且非均质性非常严重的特征.储层非均质性是储集岩石的基本属性,它严重影响和制约着油气储集层的渗透性能和油气藏开发效果。综合应用沉积微相、物性分析、扫描电镜、铸体薄片、X-衍射和阴极发光等测试技术,通过研究储层的岩性、物性和孔隙结构等特征,对储层非均质性从层内、层间和平面三个层面进行了深入分析。研究结果表明苏48区块盒8上1、山11层内非均质性较强,盒8上2、盒8下1、盒8下2、山12、山13非均质性中等,盒8下1小层具有高砂岩密度与高分层系数组合特征,层间非均质性中等至较强,盒8上2、盒8下2、山12小层具有较高砂岩密度与较高分层系数组合特征层间非均质性中等,山11小层具有低砂岩密度与低分层系数组合特征,层间非均质性较弱。分析认为控制研究区盒8和山1储集层非均质性的主要影响因素为储层的沉积微相及成岩相,储层物性平面分布非均质性受砂体的发育程度及沉积微相的控制。
The Sulige gas field in the Ordos Basin is a typical low-efficiency and tight sandstone gas field. The main reservoirs 8 and 9 in the Su 48 area of the Ordos Basin are characterized by low porosity, low permeability, low abundance and very heterogeneity. Layer heterogeneity is the basic property of reservoir rock, which seriously affects and restricts the permeability of oil and gas reservoirs and the effect of reservoir development. Comprehensive application of sedimentary microfacies, physical properties analysis, scanning electron microscopy, cast thin films, X-ray diffraction and cathodoluminescence testing techniques, through the study of reservoir lithology, physical properties and pore structure and other characteristics of the reservoir heterogeneity from the layer Internal, inter-layer and plane three levels in-depth analysis. The results show that in Su 48 block box 8, there is strong heterogeneity in the upper layer 1 and the upper layer 11, and the upper box 2, the lower box 8, the lower box 8, the lower layer 2, the mountain 12 and the mountain 13 are medium heterogeneity, The lower 8 layers have the combination of high sandstone density and high stratification coefficient, and the interlayer heterogeneity is moderate to strong. The upper 8 and lower 8 boxes of Box 8 have the higher sandstone density and higher The stratified coefficient combination features interlaminar heterogeneity, and the Shan 11 sublayer has the combination of low sandstone density and low stratification coefficient, and the interlaminar heterogeneity is weak. The analysis shows that the main influencing factors for the heterogeneity of the reservoirs in Box 8 and Shan 1 are the sedimentary microfacies and diagenetic facies of reservoirs, and the heterogeneity of reservoir physical property is affected by the development of sand bodies and the depositional micro Phase control.